Hydrothermal Growth Mechanism of Barium Titanate Nanocrystals with a Novel Dodecahedral Morphology
ZHAN Hongquan1, DENG Ce1, WU Chuanqi1, LI Xiaohong1, XIE Zhipeng2, WANG Chang’an2
1 School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403 2 School of Materials Science and Engineering, Tsinghua University, Beijing 100084
Abstract: In this study, using the surfactant PEG200, a novel dodecahedral nanocrystals of barium titanate with twelve (110) crystal surfaces were synthesized by hydrothermal method. The growth and structural characteristics of barium titanate nanoparticles under the hydrothermal conditions were analyzed by X-ray diffraction (XRD) and scanning electron microscope (SEM): In the initial stage of the reaction, under the strong alkaline condition, the surface of the precursor TiO2 particles was dissolved and BaTiO3 nucleation was produced rapidly; Under the action of PEG200, the crystal nucleus of BaTiO3 regrew through the process of dissolution and precipitation, and finally grew into the dodecahedral nanocrystals. Using Johnson-Mehl-Avrami (JMA) equation, the kinetic simulation results show that the crystal nucleation is a control step, and the crystal growth is governed by the mechanism of “solution-precipitation”. It is revealed that the growth mechanism of barium titanate dodecahedral nanocrystals using TiO2 particles as the precursor is the formation process of “solution-precipitation” under the surfactant control.
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2019, Vol. 33 
